void LowMemoryDetector::process_sensor_changes(TRAPS) {

  {- -------------------------------------------
  (1) (変数宣言など)
      ---------------------------------------- -}

      ResourceMark rm(THREAD);
      HandleMark hm(THREAD);

  {- -------------------------------------------
  (1) 全ての MemoryPool を辿り, 
      usage sensor および gc usage sensor 内の未処理の通知に対する送信処理を行う
      (SensorInfo::has_pending_requests() で未処理の通知があるかどうかを確認し, 
       あれば SensorInfo::process_pending_requests() で送信処理を行う)
      ---------------------------------------- -}

      // No need to hold Service_lock to call out to Java
      int num_memory_pools = MemoryService::num_memory_pools();
      for (int i = 0; i < num_memory_pools; i++) {
        MemoryPool* pool = MemoryService::get_memory_pool(i);
        SensorInfo* sensor = pool->usage_sensor();
        SensorInfo* gc_sensor = pool->gc_usage_sensor();
        if (sensor != NULL && sensor->has_pending_requests()) {
          sensor->process_pending_requests(CHECK);
        }
        if (gc_sensor != NULL && gc_sensor->has_pending_requests()) {
          gc_sensor->process_pending_requests(CHECK);
        }
      }
    }